You’re welcome

No not to NAS. To the local disk.

For example in Proxmox I have /media/ssd-storage/Containers/ where each subfolder is mounted to it’s VM (therefore isolated) and each VM’s docker-compose file brings in the volume mounts to it’s containers.

Then, all containers are backed up with a duplication of the ‘Containers’ folder. In a couple cases the container itself needs to be shut down in order to be backed up safely but those are few, far-between, and outdated.